Rolling mill with supported working rolls



Jan. 3, 1928.

A. KRIWAN' ROLLING KILL WITH SUPPORTED WORKING ROLLS 3 Sheets-Sheet 1 Filed Dec. 24. 1926 Jan. s, 1928. r 1,655,063

A. KRIWAN ROLLING MILL WITH SUPPORTED WORKING ROLLS Filed Dec. 24, 192Q 3 Sheets-Sheet 2 d I|| f ,l

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A. KRIWAN ROLLING MILL WITH SUPPORTED WORKING ROLLS Filed D60. 24. 1926 3 Sheets-Sheet 3 lf/frrasjs'es: MJQ- f/Zat X j rolls and undergoing. a shifting motion shaft and by Patented as; 3, 1928.

ARNOLD KRIWAN, OF MAHRISCH-OSTRAU-PRIVOZ, OZECHOSLOVAKIA.

ROLLIHG MILL WITH SUPPOB'I'ED WORKING ROLLS.

Application filed December 24, 1926, Serial No. 156,937, and in Germany December 8, 1924.

This invention relates more particularly to that type ofrolling-mills for the elongation of material in'which the working rolls are supported' In such rolling-mills the diameter of the rolls should be as small as possible, because experience has shown that rolls of small diameter produce great elongation of the material to be rolled. Said rolls of small diameter, however, show, under 1 the counter-pressure of the material to be I rolled, a considerable sagging or deflection and must therefore be supported. For this purpose it has previously been proposed to adopt, either, supporting rolls extending over the entire length of the working rolls and running in bearings in the housings, or supporting rails resting'on the working .while the rolls are revolving. The knownsupporting rolls are applicable for vplain workingrolls only, and not for rolls having various diameters on their longitudinal extent. In addition thereto, there occur very strong pressures and frictional strains in the necks of. the supporting rolls, so that Special cooling arrangements have to be provided.

' Furthermore, rolling-mills, have become known, in whichthe comparatively thin working rolls are supported by short sup-v porting rolls revolubly arranged on stationary shafts and distributed over the whole length of the working rolls. Said supporting rolls are secured against lateral displacement and preferably constructed as roller-bearings,.to ensure a reliable working. In order to attain a better support of'the working rolls and to reduce the number of the supporting members, the present invention provides for each working 'roll a plurality of short supporting rolls, comprising each a plurality of roller-bearings revolubly mounted on a stationary shaft and a; roller-shaped body enclosing the latter and '45 bein'g in'direct contact with the working roll, cavities being formed by said rollerbe'arings within the supporting rolls, which cavities are used as lubricating chambers. The distances between the roller-bearings are secured by inwardlyprojecting. shoulders on the roller-shaped body and by inter-v mediary rings on said shaft respectively, while the roller-bearings are secured against outward displacement by a shoulder on said a ball-bearing at one end of said body respectively.

The accompanying drawings illustrate the improved rolling-mill in two appropriate constructional forms, namely as a twin and as a threc-high rolling-mill respectively Fig. 1 is a side view of a twin rolling-mill, Figs. 2 and 3 are respectively a longitudinal and a transverse section through the latter, Fig. 4 shows a detail of Fig. 2 on a larger scale, Fig. 5 shows the mountin of the ends of the working rolls in a si e view, and Fig. 6 the same in a horizontal section on the line 66 of Fig. 5, Fig. 7 shows the mounting of the ends of the'supporting rolls in a side view, and Fig. 8 the same in a horizontal section on the line 8-8 of Fig. 7. Fig. 9 is a similar view to Fig. 3 of a threehigh rolling-mill, and Fig. 10 shows part of a working roll for the latter with a bearing for the same in section, on a larger scale.

76 The two working rolls a of the twin roll ing-mill illustrated in Figs. 1 to 8 inclusive, are each supported by two pairs of supporting members I), 0 revolubly arranged on stationary shafts d, which are immovably mounted in housings e and screw-threaded at their ends so as to be fixed at the outside of said housings by means of nuts d (Fi 4).

As shown in Fig. 4 on a larger sca e, each supporting member comprises two rollerbearings'of which the inner counter-rings are fitted with races for obliquely arranged rollers g, on which the outer counter-rings it are revolubly mounted. Said outer rings 71, are connected and enclosed by an outer steelcylinder a, a cavity being left between the rings to serve as a lubricating chamber. Said ringsbear attheir inner ad acent ends against. an inwardly projecting shoulder m of the steel cylinder 2' and against anintermediary ring 71. on the shaft (Z respectively, while theyare secured against outward displacement by a' shoulder 0 on the shaft (13 and a ball-bearing 72 at one end of the cylinder 2' respectively; end discs 9, r, of which the latter bears from inside against the housing 6, serving to close the steel cylinder i at its ends and to provide counter-bearings for the outer rings is and for the ball-bearing 3;

respectively. The steel cylinder 2' forming thus a roller-shaped body, is indirect contact with the working roll to be supported,

and it ispreferably provided with a slightly convex rim (Fig. 2) to prevent undue friction ith the working roll when the latter-is under high-load or pressure.

' As shown in Figs. 5 and 6, the working rolls a can be laterally withdrawn after removal of the guiding-rails 8, while the housing in the opposite framing remains therein. A dismounting of the counter-beam ings is not required. v

As shown in Figs. 7 and 8, the housing e for the supporting roll I) is held at one side by a removable rail t.

The roller-bearings mounted on the stationary shafts, as well as the supporting bearings arranged -on the housings, remain always closed. r Fig. 9 illustrates a three-high rolling-mill having a fixed middle working roll a and supporting rolls b 0 for the rotary working rolls a, while Fig. 10 shows a bearing for a rotary working roll a j Said bearing is provided with -a middle cavity u and two lateral cavities 2). The latter receive eachtwo or more metal rin s w located at an angle of 49 and fitted on t ieir outer sides and edges with a strong washer z of rubber linen on which acts a steel disc m by means of an outwardly projecting screw y. Said cavities v are filled with a lubricant,

which is tightly held therein by means of the just described contrivance, while the middle cavity a serves for cooling purposes.

What I claim, is

1. The combination, 1n a rolling-mill, of supported working rolls, a plurality of my hand.

axially immovableshort supporting rolls for each workingroll distributed over substantially the whole length of the latter and comprising each' a pluralit of. roller-bearings and a roller-shaped bo y enclosing the latter and being in direct contact with said working rolls, lubricating cavities being formed by said roller-bearings in saidsupmeans to secure the latter against outward displacement.

3. In a construction as specified in claim 1, an inwardly projecting shoulder on said roller-shaped body, an intermediary ring on said shaft, both arranged between the adjacent inner ends of said.roller-bearings, a shoulder on said shaft bearing against one .outer end of said roller-bearings, and a ballbearing at one end of said roller-shaped body bearingagainst the other outer end of said roller-bearings.

In testimony whereof I have hereunto set ARNOLD KRIWAN. 

